# US 10,307,998 B2 · Intermediate film for laminated glass and laminated glass

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,307,998 B2
- Document ID: US10307998B2
- Status: Granted
- Kind: B2
- Application number: 15/816,676
- Filed: 2017-11-17
- Published: 2018-05-03
- Granted: 2019-06-04
- Earliest claimed: 2013-11-14
- Assignees: Sekisui Chemical Co., Ltd.
- Applicants: Sekisui Chemical Co., Ltd.
- Inventors: Kazuhiko Nakayama; Kouhei Yamaguchi; Yasuyuki Izu
- Web page: https://patentgrep.com/patent/US10307998B2

## CPC

- B32B 27/08: of synthetic resin
- B32B 5/142: {Variation across the area of the layer}
- B32B 5/145: {Variation across the thickness of the layer}
- B32B 17/10559: {Shape of the cross-section}
- B32B 17/10623: {Whitening agents reflecting visible light}
- B32B 17/1066: {imparting a tint in certain regions only, i.e. shade band}
- B32B 17/10678: {comprising UV absorbers or stabilizers, e.g. antioxidants}
- B32B 17/10688: {Adjustment of the adherence to the glass layers}
- B32B 17/10761: {containing vinyl acetal}
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/22: using plasticisers
- B32B 2264/10: Inorganic particles
- B32B 2307/412: Transparent
- B32B 2605/00: Vehicles
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

There is provided an interlayer film for laminated glass with which laminated glass having a gradation pattern with suppressed color irregularity can be prepared. The interlayer film for laminated glass according to the present invention includes a first resin layer containing a thermoplastic resin and a plasticizer and a second resin layer containing a thermoplastic resin, a plasticizer and inorganic particles, and the first resin layer being arranged on a first surface side of the second resin layer, wherein a gradation part being a region where the parallel light transmittance is greater than 30% and less than 60% and being a region where the thickness of the second resin layer is continuously decreased in the direction orthogonal to the thickness direction of the interlayer film at the time of preparing the laminated glass exists, and the complex viscosity at 200° C. of the second resin layer is greater than or equal to 0.7 times and less than or equal to 2 times the complex viscosity at 200° C. of the first resin layer.

## Claims

### Claim 1

An interlayer film for laminated glass, comprising:
a first resin layer containing a thermoplastic resin and a plasticizer; and
a second resin layer containing a thermoplastic resin, a plasticizer and inorganic particles, the content of the inorganic particles being greater than or equal to 03% by mass in 100% by mass of the whole second resin layer, and the first resin layer being arranged on a first surface side of the second resin layer,
wherein a gradation part being a region where the parallel light transmittance is greater than 30% and less than 60% and being a region where the thickness of the second resin layer is continuously decreased in the direction orthogonal to the thickness direction of the interlayer film at the time of preparing the laminated glass with two sheets of clear glass in accordance with JIS R3202 (1996) exists, and
the complex viscosity at 200° C. of the second resin layer is greater than or equal to 0.7 times and less than or equal to 2 times the complex viscosity at 200° C. of the first resin layer.

### Claim 2 (depends on 1)

The interlayer film for laminated glass according to claim 1, wherein a portion of the first resin layer is arranged on a second surface side opposite to the first surface side of the second resin layer, and
the second resin layer is embedded in the first resin layer.

### Claim 3 (depends on 1)

The interlayer film for laminated glass according to claim 1, wherein the second resin layer is arranged at a partial region in the direction orthogonal to the thickness direction of the interlayer film, and
a region where the second resin layer does not exist exists, separately from the gradation part, as a partial region in the direction orthogonal to the thickness direction of the interlayer film.

### Claim 4 (depends on 1)

Laminated glass, comprising:
a first laminated glass member, a second laminated glass member; and
an interlayer film for laminated glass according to claim 1,
wherein the interlayer film for laminated glass is arranged between the first laminated glass member and the second laminated glass member.

### Claim 5 (depends on 2)

The interlayer film for laminated glass according to claim 2, wherein the second resin layer is arranged at a partial region in the direction orthogonal to the thickness direction of the interlayer film, and
a region where the second resin layer does not exist exists, separately from the gradation part, as a partial region in the direction orthogonal to the thickness direction of the interlayer film.

### Claim 6 (depends on 4)

The laminated glass according to claim 4, wherein a portion of the first resin layer is arranged on a second surface side opposite to the first surface side of the second resin layer, and
the second resin layer is embedded in the first resin layer.

### Claim 7 (depends on 4)

The laminated glass according to claim 4, wherein the second resin layer is arranged at a partial region in the direction orthogonal to the thickness direction of the interlayer film, and
a region where the second resin layer does not exist exists, separately from the gradation part, as a partial region in the direction orthogonal to the thickness direction of the interlayer film.

### Claim 8 (depends on 6)

The laminated glass according to claim 6, wherein the second resin layer is arranged at a partial region in the direction orthogonal to the thickness direction of the interlayer film, and
a region where the second resin layer does not exist exists, separately from the gradation part, as a partial region in the direction orthogonal to the thickness direction of the interlayer film.